bpo-35436: Add missing PyErr_NoMemory() calls and other minor bug fixes. (GH-11015)

Set MemoryError when appropriate, add missing failure checks,
and fix some potential leaks.

2 files changed, 13 insertions, 2 deletions

diff --git a/PC/getpathp.c b/PC/getpathp.c
index 452501a..76d3a08 100644
--- a/PC/getpathp.c
+++ b/PC/getpathp.c
@@ -575,6 +575,9 @@ read_pth_file(_PyPathConfig *config, wchar_t *prefix, const wchar_t *path)
     size_t prefixlen = wcslen(prefix);
 
     wchar_t *buf = (wchar_t*)PyMem_RawMalloc(bufsiz * sizeof(wchar_t));
+    if (buf == NULL) {
+        goto error;
+    }
     buf[0] = '\0';
 
     while (!feof(sp_file)) {
@@ -603,17 +606,22 @@ read_pth_file(_PyPathConfig *config, wchar_t *prefix, const wchar_t *path)
 
         DWORD wn = MultiByteToWideChar(CP_UTF8, 0, line, -1, NULL, 0);
         wchar_t *wline = (wchar_t*)PyMem_RawMalloc((wn + 1) * sizeof(wchar_t));
+        if (wline == NULL) {
+            goto error;
+        }
         wn = MultiByteToWideChar(CP_UTF8, 0, line, -1, wline, wn + 1);
         wline[wn] = '\0';
 
         size_t usedsiz = wcslen(buf);
         while (usedsiz + wn + prefixlen + 4 > bufsiz) {
             bufsiz += MAXPATHLEN;
-            buf = (wchar_t*)PyMem_RawRealloc(buf, (bufsiz + 1) * sizeof(wchar_t));
-            if (!buf) {
+            wchar_t *tmp = (wchar_t*)PyMem_RawRealloc(buf, (bufsiz + 1) *
+                                                            sizeof(wchar_t));
+            if (tmp == NULL) {
                 PyMem_RawFree(wline);
                 goto error;
             }
+            buf = tmp;
         }
 
         if (usedsiz) {
diff --git a/PC/launcher.c b/PC/launcher.c
index 0242f26..4c620da 100644
--- a/PC/launcher.c
+++ b/PC/launcher.c
@@ -1763,6 +1763,9 @@ process(int argc, wchar_t ** argv)
         }
         cch += (DWORD)wcslen(PYTHON_EXECUTABLE) + 1 + 1; /* include sep and null */
         executable = (wchar_t *)malloc(cch * sizeof(wchar_t));
+        if (executable == NULL) {
+            error(RC_NO_MEMORY, L"A memory allocation failed");
+        }
         cch_actual = MultiByteToWideChar(CP_UTF8, 0, start, len, executable, cch);
         if (!cch_actual) {
             error(RC_BAD_VENV_CFG, L"Cannot decode home path in '%ls'",